Check and explore a data file in your browser.

Drop in a CSV, JSON, or Parquet file. See what is in each column, ask questions with SQL, and find personal information. The file stays in your browser.

Your file stays in this browser. Nothing is sent to a server.

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SQL is a way to ask questions of tabular data. PII means personal information that could identify someone.

How it works. The page reads the file in browser memory, then creates a table called data. It can summarise columns, run SQL questions, and replace likely personal information in an exported copy.

The technical engine is DuckDB-WASM, which runs database code inside a browser worker. Pattern checks look for email addresses, phone numbers, card numbers, internet addresses, and national identifiers.